MCAT Organic Chemistry Question 30: Answer and Explanation
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Question: 30
15. If the methyl groups of butane are 120° apart, as seen in a Newman projection, this molecule is in its:
- A. highest-energy gauche form.
- B. lowest-energy staggered form.
- C. middle-energy eclipsed form.
- D. highest-energy eclipsed form.
Correct Answer: C
Explanation:
In butane, the position at which the two methyl groups are 120° apart is an eclipsed conformation. This has a moderate amount of energy, although not as high as a totally eclipsed conformation in which the two methyl groups are 0° apart.